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Maxim > Products > [Temperature Sensors]  [1-Wire® Devices] 
DS18B20
Programmable Resolution 1-Wire Digital Thermometer


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Status
Active: In Production.

Data Sheet
FULL DATA SHEET (PDF, 224kB)
Download this datasheet in PDF formatDownload   Send this datasheet to any email addressE-Mail

Description
The DS18B20 digital thermometer provides 9-bit to 12-bit Celsius temperature measurements and has an alarm function with nonvolatile user-programmable upper and lower trigger points. The DS18B20 communicates over a 1-Wire® bus that by definition requires only one data line (and ground) for communication with a central microprocessor. It has an operating temperature range of -55°C to +125°C and is accurate to ±0.5°C over the range of -10°C to +85°C. In addition, the DS18B20 can derive power directly from the data line ("parasite power"), eliminating the need for an external power supply.

Each DS18B20 has a unique 64-bit serial code, which allows multiple DS18B20s to function on the same 1-Wire bus. Thus, it is simple to use one microprocessor to control many DS18B20s distributed over a large area. Applications that can benefit from this feature include HVAC environmental controls, temperature monitoring systems inside buildings, equipment, or machinery, and process monitoring and control systems.

Key Features   Applications/Uses
  • Unique 1-Wire Interface Requires Only One Port Pin for Communication
  • Each Device has a Unique 64-Bit Serial Code Stored in an On-Board ROM
  • Multidrop Capability Simplifies Distributed Temperature-Sensing Applications
  • Requires No External Components
  • Can Be Powered from Data Line; Power Supply Range is 3.0V to 5.5V
  • Measures Temperatures from -55°C to +125°C (-67°F to +257°F)
  • ±0.5°C Accuracy from -10°C to +85°C
  • Thermometer Resolution is User Selectable from 9 to 12 Bits
  • Converts Temperature to 12-Bit Digital Word in 750ms (Max)
  • User-Definable Nonvolatile (NV) Alarm Settings
  • Alarm Search Command Identifies and Addresses Devices Whose Temperature is Outside Programmed Limits (Temperature Alarm Condition)
  • Available in 8-Pin SO (150 mils), 8-Pin µSOP, and 3-Pin TO-92 Packages
  • Software Compatible with the DS1822
  • Applications Include Thermostatic Controls, Industrial Systems, Consumer Products, Thermometers, or Any Thermally Sensitive System

 
  		• Agricultural Equipment
  		• Audio Equipment
  		• Automotive
  		• Climate Control
  		• GPS Devices
  		• Hard Disk Drive
  		• Medical Equipment
  		• Set-Top Boxes
  		• Telecommunications

    Key Specifications:  Temperature Sensors
    Part Number Sensor Type Interface Accuracy
    (±°C)    		 Parasite Pwr. Temp. Thresh. Temp. Resolution
    (bits)    		 Multi Droppable Oper. Temp.
    (°C)    		 Smallest Available Pckg.
    (mm2)    		 Price
    max w/pins See Notes
    DS18B20  Local 1-Wire 0.5 Yes Programmable (NV)
    9
    10
    11
    12
    		 Yes -55 to +125 16 $1.76 @1k
    See All Temperature Sensors (99)

    Diagram
    DS18B20: Block Diagram
    Block Diagram

    Application Notes
  		• Application Note 27: Understanding and Using Cyclic Redundancy Checks with Maxim iButton Products - DS18B20
  		• Application Note 120: Using an API to Control the DS1WM 1-Wire® Bus Master - DS18B20
  		• Application Note 122: Using Dallas' 1-Wire ICs in 1-Cell Li-Ion Battery Packs With Low-Side N-Channel Safety FETs Master - DS18B20
  		• Application Note 126: 1-Wire® Communication Through Software - DS18B20
  		• Application Note 148: Guidelines for Reliable Long Line 1-Wire® Networks - DS18B20
  		• Application Note 158: 1-Wire® Tagging with XML - DS18B20
  		• Application Note 162: Interfacing the DS18X20/DS1822 1-Wire Temperature Sensor in a Microcontroller Environment - DS18B20
  		• Application Note 187: 1-Wire Search Algorithm - DS18B20
  		• Application Note 192: Using the DS2480B Serial 1-Wire Line Driver - DS18B20
  		• Application Note 208: Curve Fitting the Error of a Bandgap-Based Digital Temperature Sensor - DS18B20
  		• Application Note 244: Advanced 1-Wire Network Driver - DS18B20
  		• Application Note 1100: White Paper 5: Using 1-Wire APIs for Data Sheet Commands - DS18B20
  		• Application Note 2420: 1-Wire Communication with a Microchip PICmicro Microcontroller - DS18B20
  		• Application Note 2965: 1-Wire® Master Device Configuration - DS18B20
  		• Application Note 3489: Installing the DS9123O USB Adapter on Windows® 98 - DS18B20
  		• Application Note 3754: Single-Wire Serial Bus Carries Isolated Power and Data - DS18B20
  		• Application Note 3930: Package Thermal Resistance Values (Theta JA, Theta JC) for Dallas Semiconductor Temperature Sensors - DS18B20
  		• Application Note 3965: How to Use the MAXQ3212 Microcontroller as a Digital Thermostat - DS18B20
  		• Application Note 4255: How to Power the Extended Features of 1-Wire® Devices - DS18B20
  		• Application Note 4277: Getting Started with the MAXQ2000 USB Thumb Evaluation Kit - DS18B20
  		• Application Note 4377: Comparison of the DS18B20 and DS18S20 1-Wire® Digital Thermometers - DS18B20
  		• Application Note 4600: Simple Software Validates the Hardware CRC and Detects Errors in the Serial Bit Stream of 1-Wire® Thermal Devices - DS18B20

    Design Guides
  		• Thermal Management (PDF)
  		• Battery Management (PDF)
  		• 1-Wire® Products (PDF)

    Reliability Reports
  		• Reliability Report: DS18B20.pdf

    Software/Models
    none

    Ordering Information
    Notes:

    1. Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
    2. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
    3. Part number suffixes: T or T&R = tape and reel;+ = RoHS/lead-free;# = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions.
    4. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.


    Devices: 1-15 of 15

    DS18B20 Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    DS18B20Z    
    		Active SOIC(N);8 pin;31 mm²
    Outline Drawing: 21-0041 (PDF)
    Land Pattern: 90-0096 (PDF)
    Use pkgcode/variation: S8-2*
    		-55°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    DS18B20Z/T&R    
    		Active SOIC(N);8 pin;31 mm²
    Outline Drawing: 21-0041 (PDF)
    Land Pattern: 90-0096 (PDF)
    Use pkgcode/variation: S8-2*
    		-55°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    DS18B20Z+  
    		Active SOIC(N);8 pin;31 mm²
    Outline Drawing: 21-0041 (PDF)
    Land Pattern: 90-0096 (PDF)
    Use pkgcode/variation: S8+2*
    		-55°C to +125°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS18B20Z+T&R    
    		Active SOIC(N);8 pin;31 mm²
    Outline Drawing: 21-0041 (PDF)
    Land Pattern: 90-0096 (PDF)
    Use pkgcode/variation: S8+2*
    		-55°C to +125°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS18B20+PAR  
    		Active TO92;3 pin;20 mm²
    Outline Drawing: 21-0248 (PDF)
    Land Pattern: Not Applicable
    Use pkgcode/variation: Q3+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS18B20    
    		Active TO92;3 pin;20 mm²
    Outline Drawing: 21-0248 (PDF)
    Land Pattern: Not Applicable
    Use pkgcode/variation: Q3-1*
    		-55°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    DS18B20/T&R    
    		Active TO92;3 pin;28 mm²
    Outline Drawing: 21-0250 (PDF)
    Land Pattern: Not Applicable
    Use pkgcode/variation: Q3-4*
    		-55°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    DS18B20+  
    		Active TO92;3 pin;20 mm²
    Outline Drawing: 21-0248 (PDF)
    Land Pattern: Not Applicable
    Use pkgcode/variation: Q3+1*
    		-55°C to +125°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS18B20-SL/T&R    
    		Active TO92;3 pin;20 mm²
    Outline Drawing: 21-0248 (PDF)
    Land Pattern: Not Applicable
    Use pkgcode/variation: Q3-1*
    		-55°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    DS18B20-SL+T&R    
    		Active TO92;3 pin;20 mm²
    Outline Drawing: 21-0248 (PDF)
    Land Pattern: Not Applicable
    Use pkgcode/variation: Q3+1*
    		-55°C to +125°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS18B20+T&R    
    		Active TO92;3 pin;28 mm²
    Outline Drawing: 21-0250 (PDF)
    Land Pattern: Not Applicable
    Use pkgcode/variation: Q3+4*
    		-55°C to +125°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS18B20U    
    		Active µMAX;8 pin;16 mm²
    Outline Drawing: 21-0036 (PDF)
    Land Pattern: 90-0092 (PDF)
    Use pkgcode/variation: U8-1*
    		-55°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    DS18B20U/T&R    
    		Active µMAX;8 pin;16 mm²
    Outline Drawing: 21-0036 (PDF)
    Land Pattern: 90-0092 (PDF)
    Use pkgcode/variation: U8-1*
    		-55°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    DS18B20U+  
    		Active µMAX;8 pin;16 mm²
    Outline Drawing: 21-0036 (PDF)
    Land Pattern: 90-0092 (PDF)
    Use pkgcode/variation: U8+1*
    		-55°C to +125°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS18B20U+T&R    
    		Active µMAX;8 pin;16 mm²
    Outline Drawing: 21-0036 (PDF)
    Land Pattern: 90-0092 (PDF)
    Use pkgcode/variation: U8+1*
    		-55°C to +125°C RoHS/Lead-Free: Lead Free
    Materials Analysis

    More Information
  		• New Product Press Release 2001-07-27 
  		• Temperature Family by Product Type

    Related Products
    DS1822 Econo 1-Wire Digital Thermometer
    DS18B20-PAR 1-Wire Parasite-Power Digital Thermometer

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    2008-05-08
    This page last modified: 2009-10-23


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